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用地震记录的反演——作真振幅恢复处理和详细地研究时差速度,可以得到虚速度测井曲线,其精度取决于地震资料的质量和能否不增加噪音地进行反褶积。对由于地震讯号的变化和反褶积的不完善而引起虚速度测井的畸变作了研究。举出了海上和陆地在某些情况下使用测井作校准的两个例子。当地层倾角大时,时间剖面必须作偏移,虚速度测井曲线一定要用偏移剖面进行计算。对取自同一地区的声速测井和虚速度测井进行比较,将虚速度测井校正为声速测井通常能较满意地得到岩性参数变化的信息。即使没有钻井,虚速度测井也可给出沉积岩层与地震层位之间的某些关系。
Using seismic recording inversion-for true amplitude recovery processing and detailed study of the time-lag velocity, an imaginary velocity logging curve can be obtained whose accuracy depends on the seismic data quality and whether deconvolution can be performed without increasing noise. The distortion of the virtual velocity logging due to the imperfection of the change of seismic signal and deconvolution is studied. Two examples of the use of logs for calibration at sea and on land in some cases are given. When the dip of the formation is large, the time profile must be offset, and the virtual velocity logging curve must be calculated using the offset profile. Comparing acoustic-velocity and imaginary-velocity logs from the same area, it is usually satisfactory to obtain information on changes in lithology parameters by correcting an imaginary-speed well into a sound-velocity well. Even without drilling, virtual velocity logging may give some indication of the relationship between sedimentary and seismic beds.